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Permit me to do an interlude that should help understand how the Inflation Model came about.
Let's say you come back to your house one evening and you notice that a window is smashed in. You thus make the hypothesis that someone broke into your house.
After you enter the house, you notice muddy footprints going from this window to where you store your jewelry, AND that your jewelry is gone. Your initial hypothesis now fully explains three different facts that you notice about your house.
Your insurance agent, however, insists that none of these facts PROVES that you were robbed of your jewelry. Indeed, she demands that you test the mud on your floor to see if it matches the mud just outside your window -- noting that, if the mud doesn't match, then your hypothesis that someone broke into your house and walked to your jewelry box could not be true. You do the test, and find that the mud does match.
The above sums up the present state of the Inflation Model. The idea was first developed by Alan Guth in 1979, and he made this model to explain why there are no magnetic monopoles in our Universe. Later researchers noted that the Inflation Model also explains why our Universe is so uniform in its mass density AND how that mass density ended up so close to the density that permits life in our Universe. The latter question is important, because if we start with simple Hubble Expansion, then a Universe just 10^-16 more dense, or 10^-16 less dense, would result in no life in it.
None of the above PROVES Inflation, any more than the three facts about your house PROVES that you were robbed. However, it is significant that one assumption is CONSISTENT with all three observations, and it is difficult to explain even one without that assumption.
Furthermore, the Inflation Model makes specific predictions about the size of anisotropies in the Cosmic Microwave Background Radiation. If these are found to be larger than a certain size, then inflation can not be true. Measurements on these anisotropies have been done, and they have failed to disprove the idea. Again, this is not a PROOF of inflation, but scientists do like an idea that easily solves a lot of problems AND is consistent with experiments. Scientists that argue against the Inflation Model are beginning to sound like the insurance agent who refuses to agree that you've been robbed.
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Darwins opinion that living forms must be descended from extinct forms?
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What forms supporting tissue in walls of thymus and spleen?
Reticular Connective
